Divert to Sydney in the case of an emergency!!!!
I can just image it a Foxbat holding up 2 or 3 A380's then the pilot of the Foxbat quotes CASA's 18/36 safety justification as to why he shouldn't have to pay the landing fee.
And for the record there is a N/S runway in the Sydney Basin other than Mascot. Isn't the Oaks N to S